Alloy



Patented May 3, 1927.

UNITED STATES VAHAN FENER, OF CHICAGO, ILLINOIS.

ALLOY.

No Drawing.

This invention relates to alloys and has for an object to produce analloy of copper and tin in varying degrees of hardness, in its hardeststate being adaptet'l for tools or other devices ordinarily supposed torequire tempered steel.

A further object of the invention is to provide a copper and tin alloywhich can be produced in varying degrees of hardness for such purposesas bushings, hearings or electrical connections or work, the hardness ofthe metal to be controlled and determined by the requirements to whichit is to be put and exhibiting as physical characteristics loweredelongation and reduction of area.

The hardness of the alloy is determined by the proportion of tin to theproportion of copper, the greater the amount of tin the harder thealloy.

As at present practiced the hardest alloy which seems desirable would beproduced from 100 pounds of copper and pounds of tin, whereas thesoftest alloy which seems feasible would be produced from 100 pounds 25of copper and 3 pounds of tin.

As a flux and for providing for the necessary tempering and uniting ofthe metals, ammonium chloride and potassium ferrocyanide are employed.The ingredients would be about as follows:

The amount of ammonium chloride and potassium ferrocyanide above listedwill be Application filed January 14, 1826. Serial No. 81,314.

varied and the exact amount employed will be determined by the action ofthe materials and is only approximate.

In carrying out the formation of this alloy, 100 pounds of copper ismelted in any convenient or desired vessel. To the melted copper isadded the tin, for the softest metal 3 pounds of the tin. Simultaneouslywith the adding of the tin, the ammonium chloride is added gradually,the metal being agitated during the addition of this ammonium chloride.The exact amount of ammonium chloride to be added is determined from therising therefrom of a smoke or visible vapor and at the properconsistency the molten metal assumes a purplish color. After the 65metal assumes the purplish color, it is heated continuously for fiveminutes, agitation being continued all the time. After the expiration offive minutes, the molten mass is removed from heating and any filmhaving arisen to the top of the molten metal is removed. The potassiumferrocyanide, about five drachms for the softest metal, is now addedalso during agitation which is continued thereafter for one or twominutes at which time the alloy is ready to pour into molds or any formdesired.

What I claim to be new is:

An alloy comprising copper in the proportion of su stantially 100 poundsto tin varying from 3 to 25 pounds, modified by the addition of ammoniumchloride approximately one pound, and potassium ferrocyanide varyingfrom 5 to 25 drachms while the metals are in molten condition.

In testimony whereof I afiix my signature.

VAHAN FENER.

